Progress in cutting the global toll of cancer remains painfully slow, but a new blood test has sparked unusual levels of hope. Researchers say it could one day make routine screening far more effective by catching cancers earlier, when treatment has the best chance of saving lives.

The Galleri blood test, developed by US firm Grail, is the latest entrant to attract worldwide attention, after early trial results were described as "exciting" by researchers.

A press release claims the test, currently being trialled by the NHS, can detect signals from 50 cancers and correctly identify the disease in 62 per cent of people who receive a positive result.

It also appears to be highly accurate at ruling cancer out, with a reported 99.6 percent success rate among those who were disease-free.

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